# eigenEllipseHelper: Helper Function for other Ellipse-from-Eigendecomposition... In douglaswhitaker/MVQuickGraphs: Quick Multivariate Graphs

## Description

Helper function for graphing ellipses from eigendecompositions. This function is used by `bvNormalContour` and `confidenceEllipse`. Essentially this is a wrapper for `draw.ellipse` that also calculates appropriate x-axis and y-axis limits to make graphing an ellipse easier (because the entire ellipse should be visible without any work on the user's part to specify the limits).

## Usage

 `1` ```eigenEllipseHelper(mu, lengths, angle, xl, yl, lim.adj, axes, center, ...) ```

## Arguments

 `mu` column matrix giving the coordinates for the cener of the ellipse. `lengths` vector giving the major and minor axis lengths. `angle` angle of rotation (in radians). `xl` x-axis limits. If `xl = NULL` then these are computed automatically. `yl` y-axis limits. If `yl = NULL` then these are computed automatically. `lim.adj` a value giving an adjustment to the x-axis and y-axis limits computed if either `xl = NULL` or `yl = NULL`. `axes` logical. If `axes = TRUE`, then the major and minor axes are graphed. `center` logical. If `axes = TRUE` then the center of the ellipse is indicated with a point and dashed lines are drawn to the x-axis and y-axis. `...` other arguments to be passed to the graphing functions.

## Value

None

douglaswhitaker/MVQuickGraphs documentation built on Aug. 26, 2020, 11:51 p.m.